近年来，国内顺酐的表观消费量不断增加，顺酐是具有许多用途的单体和中间体，主要用于不饱和聚酯树脂和1，4_丁二醇，还可以用来增塑剂、表面涂料、农用化学品、润滑剂、苹果酸和富马酸等。
In recent years, the apparent consumption of maleic anhydride in China has been continuously increasing. Maleic anhydride is a monomer and intermediate with many uses, mainly used in the production of unsaturated polyester resin and 1,4_ Butanediol can also be used to produce plasticizers, surface coatings, agricultural chemicals, lubricants, malic acid, and fumaric acid.
顺酐的方法有苯法、正丁烷法、碳四烯烃法等，其中苯法作为传统原料，被广泛用来顺酐，传统顺酐中精制系统都是采用一塔一釜的间歇式过程，工艺流程复杂，成品质量不易控制，给企业的经济效益带来影响，且产生较多的废渣以及污水，再增加环境污染的同时，还会大大缩短洗釜的周期，容易腐蚀设备，增加企业的成本。
The methods for producing maleic anhydride include benzene method, n-butane method, carbon tetraolefin method, etc. Among them, benzene method is widely used as a traditional raw material to produce maleic anhydride. The refining system in traditional maleic anhydride production uses a batch production process with one tower and one kettle, which is complex in process flow and difficult to control the quality of finished products, which affects the economic benefits of enterprises and generates a lot of waste residue and sewage, which increases environmental pollution, It will greatly shorten the washing cycle of the kettle, easily corrode the equipment, and increase the cost of the enterprise.
顺酐厂家认为，这里要解决的问题是提供一种工艺设计合理、成品质量稳定、收率高的顺酐的连续精制系统。
The maleic anhydride manufacturer believes that the problem to be solved here is to provide a continuous refining system for producing maleic anhydride with reasonable process design, stable product quality, and high yield.
为解决上述技术问题，本发明采用的技术方案是一种顺酐的连续精制系统，包括精制釜、第二精制釜、恒沸脱水塔、溶剂回收塔以及精制塔，所述恒沸脱水塔上设有进酸水管以及加粗酐管，所述精制釜与恒沸脱水塔的下方通过管道连接且管道上设有阀门，精制釜与溶剂回收塔通过管道连接且管道上同样设有阀门，所述第二精制釜与恒沸脱水塔的下方通过管道连接且管道上设有阀门，第二精制釜与溶剂回收塔通过管道连接且管道上同样设有阀门，精制釜、第二精制釜分别与恒沸脱水塔底端的管道连通且两支管道上分别设有阀门，恒沸脱水塔上设有恒沸冷凝器，溶剂回收塔的上方设有溶剂冷凝器，且溶剂冷凝器下方设有第二二甲苯罐，溶剂回收塔的底端通过第二泵与精制塔连接，精制塔的上方连接有精制冷凝器，精制冷凝器与顺酐冷凝器进口连接，且顺酐冷凝器出口与第二成品罐连接，所述恒沸脱水塔还通过管道分别与成品罐、粗酐罐以及二甲苯罐连接。进一步，所述加粗酐管设在恒沸脱水塔的中间位置。保证粗酐在加入过程中就完全脱水，从而提闻精制收率。进一步，所述恒沸冷凝器上设有循环水出口以及循环水入口。减少温水用量的负荷。进一步，所述溶剂回收塔通过泵与第三二甲苯罐连接。进行流量稳定的强制回流，从而使塔顶温度稳定。本发明具有的优点和积极效果是由于采用上述技术方案，一塔一釜恒沸脱水，两塔一釜精馏脱成品同时连续进行；所述恒沸脱水塔还通过管道分别与成品罐、粗酐罐以及二甲苯罐连接。使恒沸脱水塔既可以进行连续精制中的脱水部分，也可以进行整套的间歇式顺酐精致；成品质量稳定，收率高；减少废渣的产生量；洗釜周期延长15-20天，减少洗釜废水的产生量。本发明使顺酐的精制过程更加方便；具有结构简单，维修方便，加工成本低、效率高等优点。
To solve the above technical problems, the technical solution adopted by the present invention is a continuous refining system for producing maleic anhydride, including a first refining kettle, a second refining kettle, a constant boiling dehydration tower, a solvent recovery tower, and a refining tower. The constant boiling dehydration tower is equipped with an acid inlet water pipe and a coarse anhydride pipe, and the lower part of the first refining kettle and the constant boiling dehydration tower is connected through a pipeline with a valve on the pipeline, The first refining kettle is connected to the solvent recovery tower through a pipeline, and the pipeline is also equipped with valves. The lower part of the second refining kettle and the constant boiling dehydration tower is connected through a pipeline, and the pipeline is equipped with valves. The second refining kettle is connected to the solvent recovery tower through a pipeline, and the pipeline is also equipped with valves. The first refining kettle and the second refining kettle are respectively connected to the pipeline at the bottom of the constant boiling dehydration tower, and valves are respectively installed on the two pipelines, There is a constant boiling condenser on the constant boiling dehydration tower, a solvent condenser above the solvent recovery tower, and a second dimethylbenzene tank below the solvent condenser. The bottom end of the solvent recovery tower is connected to the refining tower through a second pump, and a refining condenser is connected above the refining tower. The refining condenser is connected to the inlet of the maleic anhydride condenser, and the outlet of the maleic anhydride condenser is connected to the second finished product tank, The constant boiling dehydration tower is also connected to the first finished product tank, crude anhydride tank, and first xylene tank through pipelines. Furthermore, the thickened anhydride tube is located in the middle of the constant boiling dehydration tower. Ensure that the crude anhydride is completely dehydrated during the addition process, thereby improving the refining yield. Furthermore, the constant boiling condenser is equipped with a circulating water outlet and a circulating water inlet. Reduce the load of warm water usage. Furthermore, the solvent recovery tower is connected to a third xylene tank through a first pump. Conduct a forced reflux with stable flow rate to stabilize the tower top temperature. The advantages and positive effects of the present invention are due to the adoption of the aforementioned technical scheme, where one tower and one kettle are subjected to constant boiling dehydration, and two towers and one kettle are subjected to continuous distillation of the finished product simultaneously; The constant boiling dehydration tower is also connected to the first finished product tank, crude anhydride tank, and first xylene tank through pipelines. The constant boiling dehydration tower can perform both the dehydration part of continuous refining and the complete batch production of maleic anhydride; Stable product quality and high yield; Reduce the generation of waste residue; The washing cycle is extended to 15-20 days to reduce the production of washing wastewater. The present invention makes the refining process of maleic anhydride more convenient; It has the advantages of simple structure, convenient maintenance, low processing cost, and high production efficiency.
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